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<title>认识css02</title>
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	<div>1111</div>
	<div class="red">2222</div>
	<div id="blue">3333</div>
	<div id="blue" class="red">3333</div>
	<div id="blue" class="red" style="background-color: coral">3333</div>
	
	
	<p>css选择器优先级： 行内样式 > ID样式 > class类样式 > 标签样式  </p>
	
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